fifth diseasefifth disease
A mild viral disease occurring mainly in early childhood, characterized by fever, a rosy-red rash on the cheeks that often spreads to the trunk and limbs, and usually arthritis and malaise. Also called erythema infectiosum.
Origin of fifth diseaseFrom its being fifth in frequency of rash-producing childhood diseases.
Historically classified as the fifth of the classical childhood skin rashes or exanthems, after measles, scarlet fever, rubella, and Dukes' disease.